Heavy metal-containing azo dyestuffs



The invention concerns heavy metal-containing azo dyestuffs which contain a mono and a disazo dyestufi bound v, 2,933,488 fitented Apr.

compounds formed from diazotised 4- or S-arylazo-Z- to a co-ordinative hexavalent heavy metal atom. It also concerns processes for the production of such dyestuifs and their use for the dyeing of lacquers, of cellulose ester ,j

spinning masses and of material containing protein such as leather, silk, wool, furs, as well as of synthetic polypeptide fibres such as Lanital, superpolyamide and superpolyurethane fibres.

It has beenfound that very valuablechromium-containing dyestuffs are obtained if a dicyclically co-ordinated, metal-containing azo dyestuff in which each dyestufi molecule is bound to a co-ordinative hexavalent chromium atom, is added in a weakly acid, neutral or alkaline medium to a dicyclic metallising azo dyestutf, these azo dyestuffs being so chosen that the reaction product contains a sulphonated monoazo and an unsulphonated disazo dyestufi (each defined below) bound in complex linkage to one and the same chromium atom.

The o.o"dihydroxy azo dyestuffs are the preferred dicyclic metallising azo dyestufis of the present invention. However, also such o-hydroxy azo dyestufis which contain in the o'-position a substituent which can be exchanged forthe hydroxyl group or which can be converted into the hydroxyl group can be used in the production of the metal-containing dyestufis used according to the present invention which contain a co-ordinative hexavalent chromium atom for each dyestufi molecule. Examples of such dyestulfs are o-hydroxy-o'-halogen azo amino-l-hydroxybenzene compounds and naphthols coupling in o-position to a hydroxyl group. The coupling or end component respectively in the mono and disazo dyestuffs-and also the starting diazo'component of the disazo dyes ,used can contain further substituents usual in azo dyestulfs, for example, halogen, alkyl,'alkoxy, nitro, acylaminofsulp'honic acid amide, alkyl snlphonyl, aryl sulphonyl, acylfisubstituentsi" Of particular advantage for water soluble textile dyestutis of the type according to the present invention is the presence of one sulphonic acid group ly.

Ihe"metal-'free.;azo;.dyestuif which is added to the chromium-containing azo dyestuff may be only partly soluble in water. The addition is performed advantageously inaqu'eous'solution at medium temperatures, e.g. of 40-95 C. and in the presence of alkaline agents or agents which buffer the mineral acid, e.g. in the presence of sodium acetate, sodium carbonate, sodium hydroxide, etc; or in'the presence of corresponding lithium, potassium or-ammonium compounds. It can also be performed in aqueous or anhydrous lower alcohols such as'ethyl alcohol, ethylene glycol, ethylene glycol monomethyl, monodyestuffs or o-hydroxy-o'-alkoxy azo dyestuffs. The metal glycol and monoalkylesters thereof at temperatures of from 90-l50 C. Also, in sulphonated metal complex dyestuffs, the sulphonic acid groups can be split ofi either during or after the complex formation. This can be done for example with the chromium complexes of 2 (o' hydroxyarylazo) 1 hydroxynaphthalene- 4- sulphonic acids. Depending on the method of production and thereaction medium, the so-called 1:1 complex of a metallisable azo dyestufi containing one chromium atom for each dyestufl molecule to be added to the metalfreeazo dyestufi can contain still further atoms or'groups' attached at the heavy metal atom. For example aquo, acido, hydroxo complexes of the metal-containing dyestufis can be formed and used. The 1:1 complex can even contain chelated attached atoms or groups which can be displaced by the dicyclically chelating second azo dye--- ethyl or monobutylethers; Under favourable conditions, themetal-free az'odyest'uif is incorporated relatively quickly and completely. The new metal-containing dyestuffs canbe obtained from an aqueous solution by salting out and from an alcoholic solution by precipitation with water or by distilling off the organic solvent. The process"according to g the presentinvention' enables deep olive to black metal containing dyestuifs to be produced; up to now such shades could only be obtained with ditliculty from monoazo dyestufis In addition it isalso particularly advantageous that sulphonated chromium-containing textile dye- I stuffs can be produced which are distinguished by good stuff, such as occurs for example in the salicylato or f tartrat'o compounds of metal-containing monoazo dyestuffs containing one chromium atom to each dyestutf molecule. The heavy metal-containing dyestufi to be used is preferably a sulphonated monoazo dyestufi; the,

use of'heavy metal-containing disazo dyestufis however,

neutral drawingpower on to wool, very good wet fastness of the wool dyeings, interesting deep shades and relatively very good fastness ,to light.

The particularlyvaluable-black wool dyestuffs of the present invention correspond to the formula I:

B represents a 1.2-naphtl1ylene radical, sixrepresents H, NO, or halogen,

Y represents H, CH or OCH and ;',Q.and Z each represent hydrogen, halogen, lower alkyl or lower alkoxy, nitro or sulphonic acid amide groups.

insulin; textile dyestufis according to the" present invention which contain one sulphonic acid subtituent only which confers=-a suflicient water solubility are suitable'not only for thedyeing of wool from a 3.68 parts of the disazo dyestuff from diazotised 3- amino-4-hydroxy-1.l'razobenzene and 2- hydroxynapth thalene and the complex chromium compound of the type 1 chromium atom: 1 dyestufi molecule, correspondweakly' alkaline, neutral to weakly acid bath in deep 5 ing to 0.52 part of chromium and 4.39 parts of the dyeshades, but are also suitable for the dyeing ofdcather, stuii from 6-nitro-1-amino-2-hydroxynaphthaleneA-sulfurs, casein, superpolyamide and superpolyureth'ane fibres phonic .aeid-eZ-hydroxynaphthalene, are pasted in .200 or of paper: They can also be used for the dyeing of parts of water, .20 parts by volume of 2 N-caustic soda lacquers'and cellulose spinning masses. 7 lye are "added and the whole is heated for 2ghours at The following examples illustrate'the invention. where 10 90-95 Thereaction product is thenpiecipitated by not "otherwise's'tated, parts are given as parts'by weight the addition of sodium chloride, filtered oil and dried. and :the temperatures are in degrees centigrade. The A dark, water soluble powder is obtained which dyes relationship of parts by weight to parts by volume is wool, nylon and silk from a neutral or weakly acid bath as that of kilogrammes to litres. 7 in black shades. The dyeings have good fastness t0 1 a; E E 1 light. The dyestufi is also suitable for the dyeing of 6N 7 1 leaner; t

i t V v l EX AMPITE 3 non N=N ,0 1 Cr a 0K 1 a a t p Q10 of 2 N-caustic .soda lye and 4.83 parts of the disazo dy estufi from ;diazotis ed 3-amino-4-hydroxyazop benzene-4f-s1ilphonic acid dimethylamidc and 2-hydroxy- N: naphthaleneare added to :lSQ parts ofawater. Also the complex chromium compound rof the type 1- chromium atomy l dyestulf molecule, corresponding to 0.52 part V V I of chr mi m and 439 parts of thedyestglf q minted 40 3.98 "parts of the disazo dyestufi from diazotised 3- H aZQr -W FP Y- FP I M'4 P Q f -f Y amino-'4-hydroxy-2'-methoxy-1.1'-azobenzene and 2-hydro y p a ne 15 The whole 15 boned droxynaphthalene and 4.44 parts of the complex chro- 7. P I and then-evapflratedio P mium compound of the type 1 chromium atom: I dye: Pg-4s a black VP I TJ i dyes in black shades stufi'molecule which corresponds to 0.52 part of chrow havs 3 and hght- V miumtand 3.94 parts of the monoazo dyestuif from di- "EXAMPLE azotised 1-amino-2-hydroxynaphthalene-4-sulphonic acid 0, V and -2-hydroxynaphthalene are dissolved in 200 parts of water; 20 parts by volumetof 2'N-caustic soda lye are added-and the solution is stirred for 2 hours'at 90-95. The reaction product is then precipitated by the addition of 20 parts of sodiumrchloride; filtered oil and dried.- A dark, water soluble powder "is obtained which dyes wool, silk and Synthetic polypeptide fibres from a neutral to a weakly acid bathin black shades. The dyeings have good 'fastness to light. The dyestufiis also suitable'for theldyeing of'leather. i V 7 The following table contains further dyestuifsv accord ingto the presentinvention'which are obtained by the niethodsdescribed-in the abovezexamples if the complex metal compound of'the type 1' heavy metal atom I 'dyestufi molecule given in column I is reacted with the metal-flee dyestufi shownwin column H:

Table No. Metaleomplexl Metal-free dyestufiII Dyeingonwool a V orleather 1...-- 1-amlno-2-hydroxynaphtha- Cr 3-amino-4-hydroxyazobenblack.

lene-k-sult'onlc acid zene 2-hydroxy- 2-hydroxynaph naphthalene.

r 2....; --..-do a. On -3 amino 4 hydroxy 2' Do.

. "est ate? 3;"; ..-...d0...'--.s "L... (Jr 3-gmi i lo-4- y r oiryet liyl- Do.

- V ;azobenzene 2-hy- V a droxyna hthalene. 4.5..- ...d0 Or 3-am1no-'4- ydroxy-4-meth-' Do.

7 7 h if' ylazobenzene t 2- j hydroxynaphthalene.

V for 45 minutes.

7 Table( Continued) 2. A dyestufl which in the 2 parts of the chromium-containing dyestufi-according to ExampleS are dissolved in 4000 parts of water and 100 parts of previously well wetted wool are entered into the dyebath at 40-50".

2 parts of 40% acetic acid are added, the bath is brought to the boil within half an hour and kept boiling The wool is rinsed in cold water and dried. The black wool dyeing has good wet and light fastness properties.

A wool dyeing with good properties is also obtained if dyeing is performed in a liquor containing Glaubers salts.

EXAMPLE 5 5 parts of the dyestufi according to Example 3 are to the formula:

dissolved in 4000 parts of water and 100 parts of damped wool are entered at 40-50". The bath is broughtrto the boil within half an hour and kept at the boil for minutes. The wool is rinsed in cold water and dried. The black dyeing obtained has good fas tness properties.

What we claim is: v p 7 V 1. A complex chromium compound which in the free acid state corresponds to the formula:

wherein B represents a 1.2-naphthylene radical,

X represents a member selected from the group consisting of H, N0 and halogen,

Y represents a member selected from the group consisting of H, CH and OCH and Z and Q each represent a member selected from the group consisting of hydrogen, halogen, nitro, lower alkyl and lower alkoxy, A

free acid state corresponds 3. A dyestufi which in the free acid state corresponds to the formula:

4. A dyestufi which in the free acid state corresponds to the formula:

OTHER REFERENCES Lubs: Chemistry of Synthetic Dyes and Pigments," 1955, p. 135.

2,933,488 10 5. A dyesmfi which in the froe acid state corresponds 6. A dyestufi which in the free acid state corresponds to the formula: to the formula:

IIQ'OQ I 5 HM E 110:8 N=N l 0 O l 4, cr/ 10 Cr vN=N References Cited in the file of this patent UNITED STATES PATENTS 1,887,602 Straub et a1 Nov. 15, 1932 2,673,199 Widmer et a1. Mar. 23, 1954 2,775,581 Neier et a1 Dec. 25, 1956 

1. A COMPLEX CHROMIUM COMPOUND WHICH IN THE FREE ACID STATE CORRESPONDS TO THE FORMULA: 